This is like some of the Milton Stations like Dixie and Cooksville which close during the day when only buses serve the stations.I think something needs to change about buildings being open on weekends.
I myself have found myself waiting in the dead of night at Bramalea, which gets very frequent bus service even on weekends, but the building is still closed.
For a line that will actually get weekend train service, to not even have the buildings open? Unbelievable.
The only exception to the rule that I have seen is the Niagara GO station which is unstaffed but remains open during the summer.